Optimization of Relaxor Single Crystals for Bending Mode Applications

2002 ◽  
Author(s):  
T. Q. Liu ◽  
C. S. Lynch
Keyword(s):  
Single Crystals ◽  
Transverse Mode ◽  
Volume Averaging ◽  
Coupling Coefficients ◽  
Predictive Capability ◽  
Sensor Applications ◽  
A Value ◽  
Bending Mode ◽  
Piezoelectric Coupling ◽  
Relaxor Single Crystals

Rhombohedral relaxor single crystals are a class of materials that includes PZN-PT and PMN-PT in a certain range of compositions. This work presents an approach to predicting the physical properties of relaxor single crystals with an engineered domain state. A model based on properties of crystal variants and volume averaging indicates large piezoelectric coefficient d31 (690 pC/N) and d32 (−1670 pC/N) for the <110> cuts and a value over 4000 pC/N for d15 and the existence of d16 with a value as large as −2300 pC/N in <111> orientation cuts. The predictive capability of the approach results in a computational tool for the design of engineered domain states with properties optimized for specific applications. This has resulted in the identification of a crystal cut optimized for actuator and sensor applications that utilizes the transverse mode piezoelectric coupling coefficients (d31 and d32).

A New Type Multi-Mode Linear Ultrasonic Motor

2011 ◽  
Vol 189-193 ◽  
pp. 2961-2964 ◽  
Author(s):  
Tie Min Zhang ◽  
Luo Ping ◽  
Liang Li
Keyword(s):  
Longitudinal Mode ◽  
Tangential Direction ◽  
Ultrasonic Motor ◽  
Finite Element Software ◽  
Linear Ultrasonic Motor ◽  
Bending Mode ◽  
Exciting Frequency ◽  
New Type ◽  
Piezoelectric Coupling ◽  
Multi Mode

A prototype for multi-mode linear ultrasonic motor has been proposed and designed. It is designed using a combination of the first longitudinal and the first bending mode. The piezoelectric ceramics convert energy using the longitudinal d33 effect which allows an improved reliability, large vibration amplitudes and excellent piezoelectric coupling. The normal direction motion of the driving element is excited by the first longitudinal mode. The tangential direction motion of the driving element is excited by the first bending mode. The resulting displacement of the driving element is transmitted by the frictional force between the vibrator and the rail in a linear motion. The analysis on the modals of the composite vibrator by using the ANSYS finite element software has been presented in this paper. Finally, the vibrator structure of the motor and the motor's own structures are designed. The basic design is discussed and simulations are compared with the experimental results, the results show that the motor characteristics can be optimized for a particular task by choosing the appropriate operating parameters such as exciting voltage, exciting frequency and normal force.

Parameter Calibrations on MOSFET Stress Sensors

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Ren-Tzung Tan ◽  
Hsien Chung ◽  
Ben-Je Lwo ◽  
Chun-Pai Tang ◽  
Kun-Fu Tseng
Keyword(s):  
Carrier Mobility ◽  
Oxide Semiconductor ◽  
Experimental Methodology ◽  
Thermomechanical Coupling ◽  
Coupling Coefficients ◽  
Stress Monitoring ◽  
Monitoring Tool ◽  
Sensor Applications ◽  
Stress Sensors ◽  
Different Types

Due to the carrier mobility changes with the mechanical loading and its small size, the MOSFET (metal-oxide-semiconductor field-effective-transistor) has the potential to be a suitable chip stress monitoring tool for microelectronic packaging. In this work, a complete and accurate approach to calibrate the coefficients for both types of MOSFET stress sensors under thermal and mechanical loadings was investigated quantitatively. Through data from different measurement modes on different types of MOSFET, the optimal experimental methodology was next proposed for the sensor applications on packaging stress extraction. The thermomechanical coupling coefficients for the selected experimental mode were finally extracted so that packaging stress measurements with MOSFET under elevated temperature can be performed more accurately.

Modeling of piezoelectric coupling coefficients of soft ferroelectrets for energy harvesting

2019 ◽  
Author(s):  
Omar Ben Dali ◽  
Sergey Zhukov ◽  
Romol Chadda ◽  
Perceval Pondrom ◽  
Xiaoqing Zhang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Coupling Coefficients ◽  
Piezoelectric Coupling

scholarly journals Multi-layered domain morphology in relaxor single crystals with nano-patterned composite electrode

2020 ◽  
Vol 182 ◽  
pp. 10-17 ◽  
Author(s):  
Chengtao Luo ◽  
Wei-Yi Chang ◽  
Min Gao ◽  
Chih-Hao Chang ◽  
Jiefang Li ◽  
...  
Keyword(s):  
Single Crystals ◽  
Composite Electrode ◽  
Relaxor Single Crystals

Crack Orientation Dependence for Fatigue Behavior of Titanium Single Crystals

2007 ◽  
Vol 345-346 ◽  
pp. 351-354 ◽  
Author(s):  
Takahiro Sakamoto ◽  
Shinji Ando ◽  
Hiromoto Kitahara ◽  
Masayuki Tsushida ◽  
Hideki Tonda
Keyword(s):  
Single Crystals ◽  
Fatigue Behavior ◽  
Thin Sheet ◽  
Orientation Dependence ◽  
Test Method ◽  
Prismatic Slip ◽  
Bending Mode ◽  
Bending Fatigue Test ◽  
Fixed End ◽  
Fatigue Fracture Behavior

In this present study, the fatigue behavior of titanium single crystals containing cracks growing in different crystallographic orientations has been investigated. To investigate fatigue fracture behavior of small single crystals, plain bending fatigue test method for thin sheet specimen was developed. One end of the sheet specimen is fixed at a voice coil of the loudspeaker and the other end is set free. A bending mode resonance occurs in the specimen due to forced vibration at the fixed end. In A-specimen, the notch plane and the direction are (11-20) and [1-100], respectively, the crack propagated parallel to {1-100} plane and striation-like markings were observed on the fatigue surfaces. In B-specimen with a notch of (1-100) and [11-20], the crack also propagated parallel to {1-100} plane as similar to A-specimen. These cracks are deduced to extend by alternating shear on two intersecting prismatic slip systems at the crack tip. In F-specimen with a notch of (0001) and [11-20], the crack propagated parallel to (0001) and twins were observed near the crack. As a result, S-N curves of each specimen showed strong orientation dependence and the fatigue strength of F-specimen was the highest in these specimens.

Relaxor single crystals in the (Bi1/2Na1/2)1−xBaxZryTi1−yO3 system exhibiting high electrostrictive strain

2001 ◽  
Vol 90 (10) ◽  
pp. 5287-5295 ◽  
Author(s):  
Sossity A. Sheets ◽  
Andrey N. Soukhojak ◽  
Naoki Ohashi ◽  
Yet-Ming Chiang
Keyword(s):  
Single Crystals ◽  
Relaxor Single Crystals

Experiments on nuclear orientation at very low temperatures I, Establishment of a method of nuclear alinement and its application to cobalt-60

1954 ◽  
Vol 221 (1145) ◽  
pp. 170-188 ◽  
Keyword(s):  
Hyperfine Structure ◽  
Single Crystals ◽  
Magnetic Moment ◽  
Low Temperatures ◽  
Unknown Parameter ◽  
Nuclear Orientation ◽  
Magnetic Hyperfine ◽  
A Value ◽  
Adiabatic Demagnetization ◽  
Magnetic Hyperfine Structure

Experiments have been carried out which demonstrate the possibilities of the method of ‘magnetic hyperfine-structure alinement’ for the orientation of nuclei. Single crystals of composition (1% Co, 12% Cu, 87% Zn) Rb 2 (SO 4 ) 2 , 6H 2 O were cooled by adiabatic demagnetization to 0·01°K. The crystals contained a small quantity of radioactive 60 Co, which decays by β -emission followed by two γ -rays in cascade. The anisotropic distribution of the γ -rays from the oriented 60 Co nuclei was measured by an array of Geiger counters around the cryostat. The largest anisotropy observed was 33%, and the change in this anisotropy as the crystals warmed up to 1°K was fitted to theoretical curves where the only unknown parameter was the magnetic moment of 60 Co, for which a value of 3·5 ± 0·5 nuclear magnetons was deduced.

scholarly journals High electro-optic kerr effect in (Bi,K,Na)TiO3 relaxor single crystals

2012 ◽  
Vol 120 (1408) ◽  
pp. 613-615 ◽  
Author(s):  
Kotaro TAKEDA ◽  
Takuya HOSHINA ◽  
Hiroaki TAKEDA ◽  
Yuji NOGUCHI ◽  
Masaru MIYAYAMA ◽  
...  
Keyword(s):  
Single Crystals ◽  
Kerr Effect ◽  
Electro Optic ◽  
Relaxor Single Crystals
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